She lost a lot of weight due to illness; is it permissible for her not to fast?

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Check below answers in case you are looking for other related questions:
Fasting makes her lazy and causes her to lose weight; can she not fast?
Are these people obliged to fast? Are they obliged to make up the fast?

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Related Answers:
He is afraid that he may become sick because of being underweight; is he allowed not to fast during Ramadan?
Is the view of one who says that it is obligatory for sick people and travellers to break the fast and that their fast is not valid correct?
Ruling on fasting for one who is diabetic, and when is it permissible for him not to fast?
Fasting makes her lazy and causes her to lose weight; can she not fast?
Are these people obliged to fast? Are they obliged to make up the fast?

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